The velocity of light in glass is `2 xx 10^(8) m//s` and in air is `3 xx 10^(8) m//s`. If the ray passes through glass to air, calculate the value of critical angle.

Explanation

To find the critical angle when a ray of light passes from glass to air, we can use Snell's Law, which relates the angles of incidence and refraction to the refractive indices of the two media.

### Step-by-Step Solution:

1. **Identify the velocities of light in both media:**
- Velocity of light in glass, \( v_g = 2 \times 10^8 \, \text{m/s} \)
- Velocity of light in air, \( v_a = 3 \times 10^8 \, \text{m/s} \)

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